https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125313
Bug ID: 125313
Summary: ICE in coroutine handling with incomplete
std::coroutine_handle declaration and co_await
expression
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: s.kimura.h41104 at gmail dot com
Target Milestone: ---
Compiler Explorer: https://godbolt.org/z/a1PfTjKKs
Reproducer:
```
namespace std {
template <class P = void> struct coroutine_handle;
template <> struct coroutine_handle<void> {
void *address() const;
};
template <class ::E, class... Args> struct coroutine_traits {};
} // namespace std
struct S {
} s;
void foo() { co_await s; }
```
Backtrace:
<source>:14:23: internal compiler error: in dependent_type_p, at cp/pt.cc:29630
14 | void foo() { co_await s; }
| ^
0x29d6748 diagnostics::context::diagnostic_impl(rich_location*,
diagnostics::metadata const*, diagnostics::option_id, char const*,
__va_list_tag (*) [1], diagnostics::kind)
???:0
0x29cb38b internal_error(char const*, ...)
???:0
0xb2f91a fancy_abort(char const*, int, char const*)
???:0
0xbce52f finish_co_await_expr(unsigned long, tree_node*)
???:0
0xd827e3 c_parse_file()
???:0
0xf11049 c_common_parse_file()
???:0
This seems a crash on invalid and goes back to gcc-16:
https://godbolt.org/z/xa1vPnrY7
